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Which of the following statements accurately describes the characteristics of a primary key in a relational database?

Q: Answer-Which of the following statements accurately describes the characteristics of a primary key in a rel...

A primary key is a critical concept in relational databases, ensuring that each record within a table can be uniquely identified. The primary key has the following key characteristics Uniqueness Each value of a primary key must be unique across the entire table. No two rows can have the same primary key value. Non-nullable A primary key must always have a value it cannot be null. This is essential for maintaining the integrity of the database as it ensures that every record can be uniquely identified.

A A primary key can accept duplicate values as long as it is unique within the table.

B A primary key is used to establish a link between two tables by referencing the foreign key in another table.

C A primary key can be composed of multiple columns, and each combination of these columns must be unique across the table.

D A primary key can be null if the table has other unique constraints.

E A primary key is used solely for indexing purposes and does not enforce any uniqueness or integrity constraints.

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Which of the following statements accurately describes the characteristics of a primary key in a relational database?

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